def find_common_elements(letter3,letter2):    
    return[letter1 for letter1 in letter3 if letter1 in letter2]
letter3 = [1,2,3,4,5,6,7,8,3]
letter2 = [3,4,5,3,6,7,4,2,0]
end = find_common_elements(letter3,letter2)
print(end)